KickJava   Java API By Example, From Geeks To Geeks.

Java > Open Source Codes > proguard > classfile > visitor > ExceptionRangeFilter


1 /*
2  * ProGuard -- shrinking, optimization, obfuscation, and preverification
3  * of Java bytecode.
4  *
5  * Copyright (c) 2002-2007 Eric Lafortune (eric@graphics.cornell.edu)
6  *
7  * This library is free software; you can redistribute it and/or modify it
8  * under the terms of the GNU General Public License as published by the Free
9  * Software Foundation; either version 2 of the License, or (at your option)
10  * any later version.
11  *
12  * This library is distributed in the hope that it will be useful, but WITHOUT
13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
15  * for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public License
18  * along with this library; if not, write to the Free Software Foundation,
19  * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  */
21 package proguard.classfile.visitor;
22
23 import proguard.classfile.*;
24 import proguard.classfile.attribute.visitor.ExceptionInfoVisitor;
25 import proguard.classfile.attribute.*;
26
27 /**
28  * This <code>ExceptionInfoVisitor</code> delegates its visits to another given
29  * <code>ExceptionInfoVisitor</code>, but only when the visited exception
30  * overlaps with the given instruction range.
31  *
32  * @author Eric Lafortune
33  */
34 public class ExceptionRangeFilter
35 implements ExceptionInfoVisitor
36 {
37     private int startOffset;
38     private int endOffset;
39     private ExceptionInfoVisitor exceptionInfoVisitor;
40
41
42     /**
43      * Creates a new ExceptionRangeFilter.
44      * @param startOffset the start offset of the instruction range.
45      * @param endOffset the end offset of the instruction range.
46      * @param exceptionInfoVisitor the ExceptionInfoVisitor to which visits
47      * will be delegated.
48      */
49     public ExceptionRangeFilter(int startOffset,
50                                 int endOffset,
51                                 ExceptionInfoVisitor exceptionInfoVisitor)
52     {
53         this.startOffset = startOffset;
54         this.endOffset = endOffset;
55         this.exceptionInfoVisitor = exceptionInfoVisitor;
56     }
57
58
59     // Implementations for ExceptionInfoVisitor.
60
61     public void visitExceptionInfo(Clazz clazz, Method method, CodeAttribute codeAttribute, ExceptionInfo exceptionInfo)
62     {
63         if (exceptionInfo.isApplicable(startOffset, endOffset))
64         {
65             exceptionInfoVisitor.visitExceptionInfo(clazz, method, codeAttribute, exceptionInfo);
66         }
67     }
68 }
69
Popular Tags